Furnace



Patented Jan. 12, 1926.

UNITED STATES i 1,569,829 PATENT OFFICE.

JOHN TrROWLEY, OF NEW YORK, N. `Y., ASSIGrNOR` TO EUREKA FURNACE COAL & OIL ECONOMY COMPANY, INC., OF NEVI `YORK, N. Y., A CORPORATION OF NEW YORK.

FURNACE.

Application filed December 20, 1924. Serial No. 757,095.

To @ZZ whom t may concern.'

Be it known that I, JOHN T. RowLEY, a citizen of the United States of America, residing in New York, county and State of New York, have invented certain new and useful Improvements in Furnaces, of which the following isa specification.

The object of this invention is to provide a furnace which will effect a more thorough combustion of the furnace gases than has hitherto been possible with the various known types of boiler furnaces and the like. In the combustionof the several kinds of fuel used in furnaces, kilns, etc., a large volume of the gases generated in the present practice become cool and are not consumed, but instead are allowed to escape into the atmosphere through the stack of the chimney. These gases are valuable and capable of being burnt so as to provide heat. lVhen this heat is conserved and utilized, it will thereby be the means of saving fuel at the initial stage of combustion. My invention provides a furnace whereby this can be accomplished, the gases being controlled as to their volume and time of iiow toward the stackand being regulated to achieve the desired result.

The invention will be understood by reference to the accompanying drawings in conjunction with the accompanying description.

In the drawingsf- Figure l is a side elevaton of an embodi ment of my invention, one wall of the furnace casing being removed, and

Figure 2 is a plan view of the same with the top wall of the furnace casing in section; i

Figure 3 is a transverse section on the line BH3, Figure 2, looking in the direction of the arrow, and

Figure t is a transverse section on the line 4 4, Figure 2, looking in the direction of the arrow.

By reference to the accompanying drawing it will be seen that in the embodiment therein shown, l represents a boiler which in this instance is mounted upon the vertical supporting walls 2, 3. Intermediate the supporting walls 2 and 3 is a bridge wall l which eo-operates with wall 3 in supporting the grate bars 5. At the extreme rear of the furnace is the closure or rear wall 6.

Supporting wall 2 is formed with spaced apertures or ports 7 to receive the heating and mixing chambers 8 which extend longitudinally within the furnace to a point rearwardly of the bridge wall 4, at which point their inlets are positioned. A transverse heating chamber 9 is vformed in wall 2, which chamber communicates lwith a flue 10, the latter leading through rear wall 6 of the furnace and into communication with the outside air. Chamber 9 communicates with a series of outlet passages lE for admitting air into the secondary combustion chamber S intermediate the bridge wall and wall 2. 'Ihe lire box or primary combustion chamber is indicated at P.

It will be understood that suitable means will be provided for damping flue l() and portsl 7 so as to regulate the4 volume flow of the air and gases. Such means may comprise removable blocks of vitreous material, one of said blocks being indicated at 7, Figure l.

In the bridge wall 4 provision is made for openings K opposite the entrance of the mixing chambers 8, through which additional heated air may be admitted into the gases flowing into the mixingchambers and for the convenience of inspection of and access to the mixing chambers 8.

It will. be seen that the supporting wall 2 at the rear of the bridge wall aifords a rear closure for the supplementary combustion chamber S and serves as a heater for the air which passes into the heating chamber '9 via Hue 10, and into the secondary combustion chamber via the outlet passages E. When oil used for fuel, wall 2 may be used for the pre-heating of the oil in addition to heating the air, above described. In that case the oil may be passed through heating pipes disposed in the lwall or heating chambers formed therein. fall 2 may also be used for heating water or other' liquids for secondary heating purposes.

It will be noted that the mixing' chambers 8 are located near the base of the secondary combustion chamber and that their' In the operation of my device, the gases passing from the fire box or primary combustion chamber into the secondary combustion chamber are retarded by wall 2 and at that point meet the streams of heated air passing into the secondary combustion chamber through the relatively small passageway E. This causes a swirling or re volving motion of the gases by which they are thoroughly mixed with the heated air, this producing further combustion of the gases and the generation of a high temperature. The heated air, being lighter, is readily carried forwardly by the draft from the stack and passes through the mixing chainbers S. The expanded hot gases derived from the thorough combustion likewise are carried through the mixing chambers 8 and travel through the third combustion chamber N to the rear of the boiler and through its tubes, which absorb the heat.

The ports 7, at the rear end of the mixing chambers S, may be increased or decreased in size in any suitable manner, so as to regulate the volume iiow of the gases and at which points further ignition occurs, thus obtaining thorough combustion.

A damper at the breeching or entrance oi the stack may be used as customary to regulate the volume flow of the heat which has passed through the boiler after leaving the third combustion chamber N.

The mixing chambers 8 may be made ot' metal, brick or the like, the material preferably being such as to radiate heat. The flame from the fire box P will be carried by the draft through the mixing chambers 8, and the gases trapped above the mixing chambers by wall 2 will, as they are drawn forwardly with the incoming heated air, receive added heat from the mixing chambers S, so that when they enter the mixing chambers they will be in an ideal state of combustion, and this combustion will be carried on during their passage through ports 7 and their entrance within the chamber intermediate walls Q and G, which chamber may be termed the third combustion chamber N.

From the foregoing it will be seen that the secondary combustion chamber in conjunction with the mixing chambers 8 and the air inlets E serve largely as a gas producer, the hot incoming air vfrom inlets E thoroughly oxygenizing, heating and expanding the gases, the radiation from mixing chambers S further expanding the gases, until the gases are so acted upon that they reach the ideal condition for entire and thorough combustion, which combustion is effected in the ports 7 and within the third combustion chamber N primarily at the outlets of the iiues. The bricks or other means for varying the size of the mixing chambers 8 may be so proportioned to the size of the outlets of' the mixing cham bers as to permit the desired volume iiow of the gases toward the stack, and the stack chamber m will serve to regulate the strip of emission of the gases from the boiler.

Having described my invention, what I claim and desire to secure by Letters Iatent is as lollows l. In a boiler furnace, in combination with a lire box, a bridge wall, a secondary combustion chamber having connnunication with said lire box over said bridge wall, a third combustion chamber, a wall separating the third and secondary combustion chambers, means for conveying air into contact by radiation, with the heated gases in the third combustion chamber and thence to the secondary combustion chamber, and a conduit passing through said last named wall and having an inlet adjacent to the 'i rear face oi the bridge wall, the cross sectional area of said conduit being substantially less than the cross sectional area of the secondary conlbustion chamber.

2. In a. furnace, the combination with a boiler of a bridge wall disposed rearwardly oi the lire box, a second transverse wall disposed rearwardly of the bridge wall, forming a secondary combustion chamber intermediate the walls, means for convey ing air through said second wall to the secondary combustion chamber, conduits for the heated gases extending through said second wall and having inlets near the base of the secondary combustion chamber and adjacent to the bridge wall, and a third combustion chamber rearwardly of the secondary combustion chamber and communieating with said conduits.

3. In a boiler furnace, in combination with a iire box, a. bridge wall, a secondary combustion chamber having communication with said iire box over said bridge wall, a third combustion chamber, a yall separating the third and secondary combustion chambers, means ior conveying heated air into the secondary comlnlstion chamber, and means lor conveying gases from the secondary combustion chamber to the third combustion chamber, said means taking thc gases at a point adjacent to the rear :tace of the bridge wall and the effective arca of said means being substantially less than the area of the secondary combustion chamber. i

4. In a furnace, a` tire box, a bridge wall disposed rearwardly or' the fire box, a second wall disposed rearwardly oi" the bridge wall and forming a secondary combustion chamber intermediate the walls, a third wall disposed rearwardly of the second wall and forming a third combustion chamber, spaced conduits for the heated gases extending through said sccond wall and having inlets adjacent the bridge wall, the effective area of said conduits being small relatively to the effective area of the secondary combustion Chamber, means for controlling the Volume of the gases passing through said conduit7 and an air conduit extending through said` second Wall and through the third chamber whereby air JOHN T. ROVLEY. 

